ATTICA, Athens. Circa 454-404 BC. AR Tetradrachm (23mm, 17.12 g, 7h). Helmeted head of Athena right, with frontal eye / Owl standing right, head facing; olive sprig and crescent behind; all within incuse square. Kroll 8; HGC 4, 1597. Fine, slightly off center. Possibly a contemporary imitation.